a(n) = Sum_{k=0..2*n-1} T(n,k) * T(n,k+1), with T given by A026584.
A027283
a(n) = Sum_{k=0..2*n-1} T(n,k) * T(n,k+1), with T given by A026584.
Terms
- a(0) =0a(1) =6a(2) =26a(3) =206a(4) =1100a(5) =7314a(6) =42920a(7) =274010a(8) =1677332a(9) =10616070a(10) =66290046a(11) =419754586a(12) =2648500908a(13) =16818685050a(14) =106781976774a(15) =680250643910
External references
- oeis: A027283